Remove support to use a string as a service name

[Baptouuuu]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.72131% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.33%. Comparing base (665d5de) to head (0bef659).
⚠️ Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
tests/ContainerTest.php	93.54%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #11      +/-   ##
=============================================
- Coverage      97.82%   97.33%   -0.50%     
+ Complexity        19       16       -3     
=============================================
  Files              3        3              
  Lines             92       75      -17     
=============================================
- Hits              90       73      -17     
  Misses             2        2              

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